EP2504889A1 - Casing for an electrical connector - Google Patents

Casing for an electrical connector

Info

Publication number
EP2504889A1
EP2504889A1 EP10776659A EP10776659A EP2504889A1 EP 2504889 A1 EP2504889 A1 EP 2504889A1 EP 10776659 A EP10776659 A EP 10776659A EP 10776659 A EP10776659 A EP 10776659A EP 2504889 A1 EP2504889 A1 EP 2504889A1
Authority
EP
European Patent Office
Prior art keywords
hole
housing
lug
screw
designed
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP10776659A
Other languages
German (de)
French (fr)
Inventor
Jean-Pierre Picaud
Bruno Dupont
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Tyco Electronics France SAS
Original Assignee
Tyco Electronics France SAS
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Tyco Electronics France SAS filed Critical Tyco Electronics France SAS
Publication of EP2504889A1 publication Critical patent/EP2504889A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R4/00—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation
    • H01R4/28—Clamped connections, spring connections
    • H01R4/30—Clamped connections, spring connections utilising a screw or nut clamping member
    • H01R4/34—Conductive members located under head of screw
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R11/00—Individual connecting elements providing two or more spaced connecting locations for conductive members which are, or may be, thereby interconnected, e.g. end pieces for wires or cables supported by the wire or cable and having means for facilitating electrical connection to some other wire, terminal, or conductive member, blocks of binding posts
    • H01R11/11—End pieces or tapping pieces for wires, supported by the wire and for facilitating electrical connection to some other wire, terminal or conductive member
    • H01R11/12—End pieces terminating in an eye, hook, or fork
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R13/00—Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00
    • H01R13/44—Means for preventing access to live contacts
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R13/00—Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00
    • H01R13/46—Bases; Cases
    • H01R13/52—Dustproof, splashproof, drip-proof, waterproof, or flameproof cases
    • H01R13/5202—Sealing means between parts of housing or between housing part and a wall, e.g. sealing rings
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R13/00—Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00
    • H01R13/46—Bases; Cases
    • H01R13/52—Dustproof, splashproof, drip-proof, waterproof, or flameproof cases
    • H01R13/5205—Sealing means between cable and housing, e.g. grommet
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R13/00—Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00
    • H01R13/46—Bases; Cases
    • H01R13/53—Bases or cases for heavy duty; Bases or cases for high voltage with means for preventing corona or arcing
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R13/00—Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00
    • H01R13/66—Structural association with built-in electrical component
    • H01R13/70—Structural association with built-in electrical component with built-in switch
    • H01R13/701—Structural association with built-in electrical component with built-in switch the switch being actuated by an accessory, e.g. cover, locking member
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R13/00—Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00
    • H01R13/66—Structural association with built-in electrical component
    • H01R13/70—Structural association with built-in electrical component with built-in switch
    • H01R13/707—Structural association with built-in electrical component with built-in switch interlocked with contact members or counterpart
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R13/00—Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00
    • H01R13/44—Means for preventing access to live contacts
    • H01R13/447—Shutter or cover plate
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R13/00—Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00
    • H01R13/46—Bases; Cases
    • H01R13/502—Bases; Cases composed of different pieces
    • H01R13/506—Bases; Cases composed of different pieces assembled by snap action of the parts
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R13/00—Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00
    • H01R13/648—Protective earth or shield arrangements on coupling devices, e.g. anti-static shielding  
    • H01R13/658—High frequency shielding arrangements, e.g. against EMI [Electro-Magnetic Interference] or EMP [Electro-Magnetic Pulse]
    • H01R13/6598—Shield material
    • H01R13/6599—Dielectric material made conductive, e.g. plastic material coated with metal
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R13/00—Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00
    • H01R13/73—Means for mounting coupling parts to apparatus or structures, e.g. to a wall
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R2201/00—Connectors or connections adapted for particular applications
    • H01R2201/26—Connectors or connections adapted for particular applications for vehicles
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R9/00—Structural associations of a plurality of mutually-insulated electrical connecting elements, e.g. terminal strips or terminal blocks; Terminals or binding posts mounted upon a base or in a case; Bases therefor
    • H01R9/03—Connectors arranged to contact a plurality of the conductors of a multiconductor cable, e.g. tapping connections
    • H01R9/05—Connectors arranged to contact a plurality of the conductors of a multiconductor cable, e.g. tapping connections for coaxial cables
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49002—Electrical device making
    • Y10T29/49117—Conductor or circuit manufacturing
    • Y10T29/49169—Assembling electrical component directly to terminal or elongated conductor

Definitions

  • the present invention generally relates to electrical connectors. More specifically, the present invention relates to electrical connector housings for connecting a cable lug to a threaded terminal by means of a screw.
  • an electrical connector In order to connect a plurality of cable lugs to threaded electrical terminals an electrical connector is generally used which has a housing with openings for the passage of cables and openings for electrically connecting the cable lugs to the threaded terminals using screws.
  • the housings also have openings opposite the terminal openings for inserting and tightening these cable lug retention screws to the terminals.
  • a connector housing is known to this end which has an overall parallelepipedic shape forming a chamber for the lugs with lateral openings for the passage of electrical cables which terminate with lugs, and openings to a surface which is essentially
  • a contact device is provided for the protection of individuals, which contact device controls the cut-off of current upstream of the connector when the cover is removed.
  • this contact device is a micro-switch or two contact parts mounted to the housing and its cover respectively, which open an electrical circuit when the cover is open. However, this device may sometimes fail.
  • the general purpose of the present invention is to perfect electrical connector housings for connecting a cable lug to a threaded terminal in a known electrical device.
  • the purpose of the invention is to provide a housing offering a high degree of protection for individuals by improving the channel-to-channel tightness of known solutions, whilst being simple, reliable and of robust construction and economic to manufacture, assemble and disassemble.
  • the invention proposes an electrical connector housing for connecting at least one cable lug to a threaded terminal of an electrical device, including, for each lug, a hole for receiving a screw for retaining a lug in a threaded terminal, which hole has a lateral slot designed to allow a lug to penetrate the hole, a lower opening for connecting the lug to a threaded terminal and an upper opening designed to allow the passage of a screwing tool for the screw, the size of the upper opening of the hole at its widest point being strictly less than the size of the hole at its widest point, said opening being designed so as to allow the passage of the screwing tool and having a section which is less than the section of a human finger.
  • human finger is understood to be a finger which has a diameter of at least 12 mm and a radius at its tip of approximately 4 mm, which essentially corresponds to the size of an average human finger.
  • the protection of individuals is vastly improved as, according to the invention, it is impossible for a human finger to make contact with a part under voltage. Furthermore, during disassembly, the screw cannot exit the hole via the upper opening or via the lower opening as long as the lug remains inside the hole: this reduces the risk of losing the screw during interventions on the housing.
  • channel-to-channel tightness is facilitated by the design of the housing according to the invention in so far as each lug is placed into a different hole independently. If a hole is flooded the other holes will not be affected, even if the cover is removed.
  • the size of the upper opening of the hole taken at its widest point is less than or equal to 12 mm;
  • the housing has a cover provided with sealing means designed to close the hole in a sealed manner.
  • the lower opening of the hole has sealing means designed to co-operate with the device to be connected and the cover has fixing means designed to fix the cover to the device to be connected, so as to keep the housing fixed to the device via the cover in a sealed manner;
  • the cover and/or the housing have contact means designed to control the cut-off of the current upstream of the connector when the cover is removed.
  • the slot of the hole opens onto a channel designed to receive the cable of the corresponding lug, said channel being provided with sealing means to provide the tightness between the cable and the housing;
  • the channel has fixing means at its end for a sealing plug for passage of the cable in the housing and tight closure of the end of the channel;
  • the hole has protrusions on its internal surface for maintaining the screw at a predetermined height so as to retain the screw between the end of the hole which has the upper opening and the slot, so as to keep the screw spaced apart from the slot when the lug is inserted;
  • the housing is provided with a fixing screw, the end of said fixing screw, which is opposite the screw head, has a tip covered with a cap in insulating material.
  • the housing continues to effectively ensure the protection of individuals, since even if a finger is inserted into the lower opening there is no risk of an electric shock as it will encounter an insulating element.
  • the housing and/or the cover is made from a plastic material which is at least partially metallised so as to provide electrical shielding for the contents of the housing.
  • the invention further proposes, according to a second aspect, a process of connecting an electrical connector for connecting at least one cable lug to a threaded terminal of an electrical device including a housing as previously described, including steps consisting in: introducing a retention screw via the lower opening with the tip presented towards the upper opening;
  • FIG. 1 is a perspective view of a connector provided with a terminal which has two holes according to the invention
  • figure 2 is a longitudinal cut-out view of the connector of figure 1;
  • FIG. 3 is a transversal cut-out view of said connector
  • FIG. 4 is another longitudinal cut-out view of said connector
  • FIG. 5 is a perspective view of another connector provided with a housing which has three holes according to the invention.
  • FIG. 6 is a perspective view of a cable provided with a lug and a plug of the connector of figure 5;
  • FIG. 7 and 8 are two longitudinal cut-out views of the connector of figure 5 wherein a fixing screw is shown in two different positions respectively.
  • a high- voltage electrical connector 2 has a housing 1 according to the invention.
  • the connector allows two high-voltage cables 3 to be connected to an electrical device 4.
  • the housing 1 is provided with a sealing cover 6.
  • the housing 1 allows the connection of a lug 31 to a threaded terminal 41 of the electrical device 4 to be connected.
  • the lug 31 is crimped to the end of the cable and has a connection ring 32.
  • the housing 1 has a hole 11 for each lug for receiving a retention screw 12.
  • the hole 11 has a lateral slot 13 designed to allow the ring 32 of the lug to penetrate the hole.
  • the hole also has a lower opening 14 for connecting the lug to the threaded terminal 41 and an upper opening 15 designed to allow the passage of a screwing tool for the screw 12.
  • the diameter of the upper opening 15 of the hole is strictly below the diameter of the hole.
  • the opening 15 is delimited by a collar 16 provided at the upper end of the hole.
  • the size of the upper opening of the hole at its widest point is less than or equal to 12 mm, which is sufficient to allow the passage of the tip of a screwing tool but effectively prevents an individual from inserting a finger into the hole.
  • the cover 6 is provided with seals 61 designed to sit in grooves 17 provided around the collars 16 to close each hole individually in a sealed manner.
  • the overall tightness is improved compared to the prior art, as when a single hole is fiooded water cannot pass from one hole to another, even when the cover 6 is removed.
  • the lower opening 14 of the hole 11 has a specific seal 18 designed to co-operate with the device 4.
  • the cover has fixing means 62 designed to fix the cover 6 to the device 4.
  • fixing means 62 designed to fix the cover 6 to the device 4.
  • this involves a fixing ring 62 through which a fixing screw (not shown) extends which screws inside the body of the device 4.
  • the cover 6 maintains the housing 1 in a sealed manner against the device 4 by means of the seals 18 of each hole 11.
  • the cover has contact means designed to ensure that the current upstream of the connector is cut-off of when the cover is removed.
  • This contact means is a metal ring 63 joined to the cover cooperating with a metal plate 43 mounted to the device to be connected. Opening of the cover causes the separation of the two metal elements and thus the opening of an electrical circuit which controls the cut-off of the current upstream of the connector.
  • the slot 13 of the hole 11 opens onto a channel 7 designed to receive the cable 3 of the corresponding lug.
  • This channel has a central seal 71 and a plug 8 at its opposite end.
  • the plug is constituted by a shell 81 which has two lobes 82 which are snapped on to two conforming tabs 72 provided to this end on the external surface of the channel 7.
  • a seal 83 ensures tightness between the cable 3 and the channel 7.
  • the channel 7 has a shielding transmission zone 73 between the shielding cover of the cable 3 and the housing 1.
  • the housing 1 is made from plastic material which is selectively metallised to provide continuity of the shielding.
  • the channel 7 is metallised with an internal metal layer 74 which ends at the surface 75, before the seal 71.
  • the shielding cover of the cable 3 makes contact with the internal metal layer 74, as can be seen in figures 2, 3 and 4.
  • This metal layer merges into an external metal layer 76 which extends along the external surface of the channel 7 up to the shoulder 77.
  • the continuity of the shielding on the channel 7 is provided by the cover 6, which is made from metal material.
  • the external metal layer 76 extends up to the shoulder 78 to the base of the hole 11, covering the edge 79.
  • the continuity of the shielding between the channel 7 and the metal cover of the electrical device 4 to be connected is made by means of the metal edge 79. This is more specifically visible in figures 2 and 3.
  • FIG. 5 shows a connector 2 with three holes 11 and three cables 3 which are in all points similar to those of the previously mentioned embodiment and which will not therefore be described in further detail.
  • the metallisation is ended on the channel 7 before the seals 71, 18 and 61. In this way, if the internal space of the channel 7 defined between these seals is flooded there is no line of current between the shielding and the conducting elements.
  • a connector plug 5 is provided for the interface between the cables and the housing, it has two seals 83 and 71 and two lobes 82, as previously described.
  • the hole 11 has protrusions 19 on its internal surface for maintaining the screw 12 at a predetermined height.
  • the connector is subsequently presented opposite the terminals 41 of the electrical device 4 to be connected.
  • the screw 12 is pushed beyond the protrusions 19 and engages in the thread of the terminal 41.
  • the lug is subsequently tightened to the terminal and the screwing tool is removed.
  • the cover 6 is installed and tightened via the ring 62, which can be seen in figure 3, to the body of the device 4.
  • the screw 12 has a tip 20 at its free end which is covered with a cap 21 made from insulating material.
  • the invention is not limited to the examples of lugs as previously described but, on the contrary, covers all types of known lugs, such as, for example, "U” plate lugs and strong section “U” or “O” round lugs.

Landscapes

  • Connector Housings Or Holding Contact Members (AREA)
  • Connections By Means Of Piercing Elements, Nuts, Or Screws (AREA)
  • Connections Arranged To Contact A Plurality Of Conductors (AREA)
  • Details Of Connecting Devices For Male And Female Coupling (AREA)

Abstract

An electrical connector (2) housing (1) for connecting at least one cable lug (31) to a threaded terminal of an electrical device (4), including, for each lug, a hole (11) for receiving a screw (12) for retaining a lug in a threaded terminal, which hole has a lateral slot (13) designed to allow a lug to penetrate the hole, a lower opening (14) for connecting the lug to a threaded terminal and an upper opening (15) designed to allow the passage of a screwing tool for the screw, the size of the upper opening of the hole at its widest point being strictly less than the size of the hole at its widest point, said opening being designed so as to allow the passage of the screwing tool and having a section which is less than the section of a human finger.

Description

CASING FOR AN ELECTRICAL CONNECTOR
The present invention generally relates to electrical connectors. More specifically, the present invention relates to electrical connector housings for connecting a cable lug to a threaded terminal by means of a screw.
In order to connect a plurality of cable lugs to threaded electrical terminals an electrical connector is generally used which has a housing with openings for the passage of cables and openings for electrically connecting the cable lugs to the threaded terminals using screws.
The housings also have openings opposite the terminal openings for inserting and tightening these cable lug retention screws to the terminals.
Generally, in the field of electrical connectors, and in the field of high- voltage electrical connectors in particular, it is necessary to provide maximum protection of individuals against contact with electrical parts under voltage.
At the same time, the tightness of connectors must be provided in certain applications, notably in electric propulsion vehicles. In particular, when the housing is closed this involves ensuring that each channel of the connector is isolated in a sealed manner relative to the other connector channels in order to prevent a short circuit between the channels in the event of water ingress in the housing.
Numerous devices of this type are known which provide protection of individuals against electrical risks, whilst keeping the contacts isolated from the outside in a sealed manner.
In particular, a connector housing is known to this end which has an overall parallelepipedic shape forming a chamber for the lugs with lateral openings for the passage of electrical cables which terminate with lugs, and openings to a surface which is essentially
perpendicular to the preceding surface for contacting the lugs with the terminals. The surface opposite the surface which has the openings for terminals is fully open to allow access to the chamber for installation and tightening of the screws to the threaded terminals. A cover which is retained by screws covers up this surface. Each opening is provided with a seal. The cover has a seal on its internal surface and sealed partition walls designed to partition off each channel inside the chamber in a sealed manner once the cover is closed. In this type of housing, a contact device is provided for the protection of individuals, which contact device controls the cut-off of current upstream of the connector when the cover is removed. In general, this contact device is a micro-switch or two contact parts mounted to the housing and its cover respectively, which open an electrical circuit when the cover is open. However, this device may sometimes fail.
In effect, when the cover is removed the screws are directly accessible and in the event of the failure of the current cut-off device the screws continue to be supplied with current and this constitutes a risk to individuals. Furthermore, once the cover is removed the seal between the channels is no longer provided.
Finally, this type of housing has numerous parts which make it costly in terms of
manufacturing and onerous to assemble. As a result of these observations, the general purpose of the present invention is to perfect electrical connector housings for connecting a cable lug to a threaded terminal in a known electrical device.
More specifically, the purpose of the invention is to provide a housing offering a high degree of protection for individuals by improving the channel-to-channel tightness of known solutions, whilst being simple, reliable and of robust construction and economic to manufacture, assemble and disassemble.
To this end, the invention proposes an electrical connector housing for connecting at least one cable lug to a threaded terminal of an electrical device, including, for each lug, a hole for receiving a screw for retaining a lug in a threaded terminal, which hole has a lateral slot designed to allow a lug to penetrate the hole, a lower opening for connecting the lug to a threaded terminal and an upper opening designed to allow the passage of a screwing tool for the screw, the size of the upper opening of the hole at its widest point being strictly less than the size of the hole at its widest point, said opening being designed so as to allow the passage of the screwing tool and having a section which is less than the section of a human finger.
The term human finger is understood to be a finger which has a diameter of at least 12 mm and a radius at its tip of approximately 4 mm, which essentially corresponds to the size of an average human finger.
In this way, and advantageously, the protection of individuals is vastly improved as, according to the invention, it is impossible for a human finger to make contact with a part under voltage. Furthermore, during disassembly, the screw cannot exit the hole via the upper opening or via the lower opening as long as the lug remains inside the hole: this reduces the risk of losing the screw during interventions on the housing.
Furthermore, channel-to-channel tightness is facilitated by the design of the housing according to the invention in so far as each lug is placed into a different hole independently. If a hole is flooded the other holes will not be affected, even if the cover is removed.
These provisions have an advantageous effect in terms of the reliability of the housing according to the invention.
According to advantageous features, possibly combined:
- the size of the upper opening of the hole taken at its widest point is less than or equal to 12 mm;
the housing has a cover provided with sealing means designed to close the hole in a sealed manner.
The protection of individuals is thus improved and obtaining tightness is facilitated.
According to advantageous features, possibly combined:
the lower opening of the hole has sealing means designed to co-operate with the device to be connected and the cover has fixing means designed to fix the cover to the device to be connected, so as to keep the housing fixed to the device via the cover in a sealed manner;
the cover and/or the housing have contact means designed to control the cut-off of the current upstream of the connector when the cover is removed.
It can be seen that, even in the event of a failure in the current cut-off device, when the housing according to the invention is opened the risks to individuals are very limited as it is impossible for a finger to be inserted via the upper opening in the hole. According to advantageous features, possibly combined:
the slot of the hole opens onto a channel designed to receive the cable of the corresponding lug, said channel being provided with sealing means to provide the tightness between the cable and the housing;
the channel has fixing means at its end for a sealing plug for passage of the cable in the housing and tight closure of the end of the channel;
the hole has protrusions on its internal surface for maintaining the screw at a predetermined height so as to retain the screw between the end of the hole which has the upper opening and the slot, so as to keep the screw spaced apart from the slot when the lug is inserted;
- the housing is provided with a fixing screw, the end of said fixing screw, which is opposite the screw head, has a tip covered with a cap in insulating material.
Also, advantageously, once disconnected the housing continues to effectively ensure the protection of individuals, since even if a finger is inserted into the lower opening there is no risk of an electric shock as it will encounter an insulating element.
According to an advantageous aspect:
the housing and/or the cover is made from a plastic material which is at least partially metallised so as to provide electrical shielding for the contents of the housing.
This provision advantageously reduces the costs of this device. The invention further proposes, according to a second aspect, a process of connecting an electrical connector for connecting at least one cable lug to a threaded terminal of an electrical device including a housing as previously described, including steps consisting in: introducing a retention screw via the lower opening with the tip presented towards the upper opening;
introducing a lug into the slot provided to this end;
presenting the connector opposite the terminals of the electrical device to be connected;
introducing a screwing tool via the upper opening;
- pushing the screw by means of the tool until it engages in the thread of the terminal; fixing the lug to the temiinal by tightening the screw by means of the screwing tool. The invention will be further explained by means of a detailed description of an embodiment, which is provided hereafter for illustrative and non-limiting purposes, with reference to the appended drawings, wherein:
- figure 1 is a perspective view of a connector provided with a terminal which has two holes according to the invention;
- figure 2 is a longitudinal cut-out view of the connector of figure 1;
- figure 3 is a transversal cut-out view of said connector;
- figure 4 is another longitudinal cut-out view of said connector;
- figure 5 is a perspective view of another connector provided with a housing which has three holes according to the invention;
- figure 6 is a perspective view of a cable provided with a lug and a plug of the connector of figure 5;
- figures 7 and 8 are two longitudinal cut-out views of the connector of figure 5 wherein a fixing screw is shown in two different positions respectively.
As can be seen in figure 1 , a high- voltage electrical connector 2 has a housing 1 according to the invention. The connector allows two high-voltage cables 3 to be connected to an electrical device 4. There are sealing plugs 5 at the interface between the housing and the cables.
As can be seen more specifically in figure 2, the housing 1 is provided with a sealing cover 6. The housing 1 allows the connection of a lug 31 to a threaded terminal 41 of the electrical device 4 to be connected. Conventionally, the lug 31 is crimped to the end of the cable and has a connection ring 32.
The housing 1 has a hole 11 for each lug for receiving a retention screw 12. The hole 11 has a lateral slot 13 designed to allow the ring 32 of the lug to penetrate the hole. The hole also has a lower opening 14 for connecting the lug to the threaded terminal 41 and an upper opening 15 designed to allow the passage of a screwing tool for the screw 12.
The diameter of the upper opening 15 of the hole is strictly below the diameter of the hole. The opening 15 is delimited by a collar 16 provided at the upper end of the hole.
In practice, the size of the upper opening of the hole at its widest point is less than or equal to 12 mm, which is sufficient to allow the passage of the tip of a screwing tool but effectively prevents an individual from inserting a finger into the hole. The cover 6 is provided with seals 61 designed to sit in grooves 17 provided around the collars 16 to close each hole individually in a sealed manner.
The overall tightness is improved compared to the prior art, as when a single hole is fiooded water cannot pass from one hole to another, even when the cover 6 is removed.
The lower opening 14 of the hole 11 has a specific seal 18 designed to co-operate with the device 4.
As can be seen more specifically in figure 3 the cover has fixing means 62 designed to fix the cover 6 to the device 4. In practice, this involves a fixing ring 62 through which a fixing screw (not shown) extends which screws inside the body of the device 4. In this way, the cover 6 maintains the housing 1 in a sealed manner against the device 4 by means of the seals 18 of each hole 11.
In a manner per se known, the cover has contact means designed to ensure that the current upstream of the connector is cut-off of when the cover is removed. This contact means is a metal ring 63 joined to the cover cooperating with a metal plate 43 mounted to the device to be connected. Opening of the cover causes the separation of the two metal elements and thus the opening of an electrical circuit which controls the cut-off of the current upstream of the connector.
As can be seen in figure 4, the slot 13 of the hole 11 opens onto a channel 7 designed to receive the cable 3 of the corresponding lug. This channel has a central seal 71 and a plug 8 at its opposite end. The plug is constituted by a shell 81 which has two lobes 82 which are snapped on to two conforming tabs 72 provided to this end on the external surface of the channel 7. Inside the shell a seal 83 ensures tightness between the cable 3 and the channel 7.
In a manner per se known, the channel 7 has a shielding transmission zone 73 between the shielding cover of the cable 3 and the housing 1. In a manner well known to a person skilled in the art, the housing 1 is made from plastic material which is selectively metallised to provide continuity of the shielding.
As can be seen more specifically in figure 4, the channel 7 is metallised with an internal metal layer 74 which ends at the surface 75, before the seal 71.
Around the zone 73, the shielding cover of the cable 3 makes contact with the internal metal layer 74, as can be seen in figures 2, 3 and 4.
This metal layer merges into an external metal layer 76 which extends along the external surface of the channel 7 up to the shoulder 77. The continuity of the shielding on the channel 7 is provided by the cover 6, which is made from metal material.
This can be seen more clearly in figure 3 which shows that the continuity of the shielding between the metal cover 6 and the channel 7 is provided around the metallised shoulder 77.
The external metal layer 76 extends up to the shoulder 78 to the base of the hole 11, covering the edge 79. The continuity of the shielding between the channel 7 and the metal cover of the electrical device 4 to be connected is made by means of the metal edge 79. This is more specifically visible in figures 2 and 3.
A further embodiment is shown in figure 5, which shows a connector 2 with three holes 11 and three cables 3 which are in all points similar to those of the previously mentioned embodiment and which will not therefore be described in further detail.
Thus, the metallisation is ended on the channel 7 before the seals 71, 18 and 61. In this way, if the internal space of the channel 7 defined between these seals is flooded there is no line of current between the shielding and the conducting elements.
A portion of cable 3 provided with a lug 31 with a ring 32, according to the invention, is shown in figure 6. It is mounted in the same way in either of the embodiments of the housing previously described (having two or three channels). A connector plug 5 is provided for the interface between the cables and the housing, it has two seals 83 and 71 and two lobes 82, as previously described.
As can be seen more specifically in figures 7 and 8, the hole 11 has protrusions 19 on its internal surface for maintaining the screw 12 at a predetermined height.
In this way, the screw is maintained between the end of the hole 11 which has the upper opening 15 and the slot 13, so as to keep the screw spaced apart from the slots and thus allow the insertion of the lug, as can be seen more specifically in figure 9. In practice, when using a connector provided with a housing according to the invention, this involves in the first instance the introduction of the retention screw 12 via the lower opening 14 by presenting the tip towards the upper opening, until it passes over the protrusions 19. The screw is maintained above the slot 13 and the lug 31 is inserted into the hole via said slot.
As can be seen in figure 10, the connector is subsequently presented opposite the terminals 41 of the electrical device 4 to be connected.
Using a screwing tool (not shown) inserted via the upper opening 15, the screw 12 is pushed beyond the protrusions 19 and engages in the thread of the terminal 41. The lug is subsequently tightened to the terminal and the screwing tool is removed. In a final step, the cover 6 is installed and tightened via the ring 62, which can be seen in figure 3, to the body of the device 4.
Moreover, in the embodiment shown in figures 9 and 10, the screw 12 has a tip 20 at its free end which is covered with a cap 21 made from insulating material.
In this way, even when the connector is disconnected from the device it maintains a high degree of safety and the possible insertion of a finger into the lower opening 14 does not constitute a risk as the first element encountered will be the insulating cap 21.
The invention is not limited to the examples of lugs as previously described but, on the contrary, covers all types of known lugs, such as, for example, "U" plate lugs and strong section "U" or "O" round lugs.
In general, numerous other variants are possible as a function of circumstances, and it should be noted in this respect that the invention is not limited to the examples described and shown.

Claims

1. An electrical connector (2) housing (1) for connecting at least one cable lug (31) to a threaded terminal of an electrical device (4), characterised in that it includes, for each lug, a hole (11) for receiving a screw (12) for retaining a lug in a threaded terminal, which hole has a lateral slot (13) designed to allow a lug to penetrate the hole, a lower opening (14) for connecting the lug to a threaded terminal and an upper opening (15) designed to allow the passage of a screwing tool for the screw, the size of the upper opening of the hole at its widest point being strictly less than the size of the hole at its widest point, said opening being designed so as to allow the passage of the screwing tool and having a section which is less than the section of a human finger.
2. The housing according to claim 1, characterised in that the size of the upper opening (15) of the hole (11) taken at its widest point is less than or equal to 12 mm.
3. The housing according to claim 1 or 2, characterised in that it has a cover (6) provided with sealing means designed to close the hole (11) in a sealed manner.
4. The housing according to claim 3, characterised in that the lower opening (14) of the hole has sealing means designed to co-operate with the device to be connected and the cover has fixing means (62) designed to fix the cover to the device to be connected, so as to keep the housing fixed to the device via the cover in a sealed manner.
5. The housing according to claim 3 or 4, characterised in that the cover and/or the housing have contact means (43, 63) designed to control the cut-off of the current upstream of the connector when the cover is removed.
6. The housing according to any one of the previous claims, characterised in that the slot of the hole opens onto a channel (7) designed to receive the cable of the corresponding lug, said channel being provided with sealing means (71) to provide the tightness between the cable and the housing.
7. The housing according to the previous claim, characterised in that the channel (7) has fixing means (82, 72) at its end for a sealing plug for passage of the cable in the housing and tight closure of the end of the channel.
8. The housing according to any one of the previous claims, characterised in that the hole has protrusions (19) on its internal surface for maintaining the screw at a predetermined height so as to retain the screw between the end of the hole which has the upper opening (15) and the slot (13), so as to keep the screw spaced apart from the slot when the lug is inserted.
9. The housing according to any one of the previous claims, characterised in that the housing is provided with a fixing screw, the end of said fixing screw, which is opposite the screw head, having a tip (20) covered with a cap (21) in insulating material.
10. The housing according to any one of the previous claims, characterised in that the housing (1) and/or the cover (6) is made from a plastic material which is at least partially metallised so as to provide electrical shielding for the contents of the housing.
11. A process of connecting an electrical connector (2) for connecting at least one cable lug (31) to a threaded terminal of an electrical device including a housing according to any one of the previous claims, characterised in that it includes steps consisting in:
introducing a retention screw (12) via the lower opening with the tip presented towards the upper opening;
introducing a lug (31) into the slot provided to this end;
- presenting the connector opposite the terminals of the electrical device to be connected;
introducing a screwing tool via the upper opening;
pushing the screw by means of the tool until it engages in the thread of the terminal; fixing the lug to the temiinal by tightening the screw by means of the screwing tool.
EP10776659A 2009-11-23 2010-11-05 Casing for an electrical connector Withdrawn EP2504889A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0958278A FR2953071B1 (en) 2009-11-23 2009-11-23 ELECTRICAL CONNECTOR HOUSING
PCT/EP2010/066910 WO2011061074A1 (en) 2009-11-23 2010-11-05 Casing for an electrical connector

Publications (1)

Publication Number Publication Date
EP2504889A1 true EP2504889A1 (en) 2012-10-03

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP10776659A Withdrawn EP2504889A1 (en) 2009-11-23 2010-11-05 Casing for an electrical connector

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US (1) US9048551B2 (en)
EP (1) EP2504889A1 (en)
JP (1) JP5682977B2 (en)
CN (1) CN102668252B (en)
FR (1) FR2953071B1 (en)
WO (1) WO2011061074A1 (en)

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Also Published As

Publication number Publication date
CN102668252B (en) 2016-11-23
CN102668252A (en) 2012-09-12
WO2011061074A1 (en) 2011-05-26
FR2953071B1 (en) 2012-04-20
JP5682977B2 (en) 2015-03-11
FR2953071A1 (en) 2011-05-27
JP2013511800A (en) 2013-04-04
US9048551B2 (en) 2015-06-02
US20120231676A1 (en) 2012-09-13

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